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Boundary Conditions of an Active West Antarctic Subglacial Lake: Implications for Storage of Water Beneath the Ice Sheet : Volume 7, Issue 3 (24/06/2013)

By Siegert, M. J.

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Book Id: WPLBN0004022864
Format Type: PDF Article :
File Size: Pages 21
Reproduction Date: 2015

Title: Boundary Conditions of an Active West Antarctic Subglacial Lake: Implications for Storage of Water Beneath the Ice Sheet : Volume 7, Issue 3 (24/06/2013)  
Author: Siegert, M. J.
Volume: Vol. 7, Issue 3
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Siegert, M. J., Ferraccioli, F., Jordan, T., Rippin, D., Brocq, A. L., Smith, B.,...Bingham, R. (2013). Boundary Conditions of an Active West Antarctic Subglacial Lake: Implications for Storage of Water Beneath the Ice Sheet : Volume 7, Issue 3 (24/06/2013). Retrieved from http://www.ebooklibrary.org/


Description
Description: Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, BS8 1SS, UK. Repeat-pass IceSat altimetry has revealed 124 discrete surface height changes across the Antarctic Ice Sheet, interpreted to be caused by subglacial lake discharges (surface lowering) and inputs (surface uplift). Few of these active lakes have been confirmed by radio-echo sounding (RES) despite several attempts (notable exceptions are Lake Whillans and three in the Adventure Subglacial Trench). Here we present targeted RES and radar altimeter data from an active lake location within the upstream Institute Ice Stream, into which 0.12 km3 of water is calculated to have flowed between October 2003 and February 2008. We use a series of transects to establish an accurate appreciation of the influences of bed topography and ice-surface elevation on water storage potential. The location of surface height change is over the downslope flank of a distinct topographic hollow, where RES reveals no obvious evidence for deep (> 10 m) water. The regional hydropotential reveals a sink coincident with the surface change, however. Governed by the location of the hydrological sink, basal water will likely drape over existing topography in a manner dissimilar to subglacial lakes where flat strong specular RES reflections are measured. The inability of RES to detect the active lake means that more of the Antarctic ice sheet bed may contain stored water than is currently appreciated. Variation in ice surface elevation datasets leads to significant alteration in calculations of the local flow of basal water indicating the value of, and need for, high resolution RES datasets in both space and time to establish and characterise subglacial hydrological processes.

Summary
Boundary conditions of an active West Antarctic subglacial lake: implications for storage of water beneath the ice sheet

Excerpt
Bamber, J. L., Gomez-Dans, J. L., and Griggs, J. A.: A new 1 km digital elevation model of the Antarctic derived from combined satellite radar and laser data – Part 1: Data and methods, The Cryosphere, 3, 101–111, doi:10.5194/tc-3-101-2009, 2009.; Bell, R. E., Studinger, M., Fahnestock, M. A., and Shuman, C. A.: Tectonically controlled subglacial lakes on the flanks of the Gamburtsev Subglacial Mountains, East Antarctica, Geophys. Res. Lett., 33, L02504, doi:10.1029/2005GL025207, 2006.; Bell, R. E., Studinger, M., Shuman, C. A., Fahnestock, M. A., and Joughin, I.: Large subglacial lakes in East Antarctica at the onset of fast-flowing ice streams, Nature, 445, 904–907, 2007.; Bo, S., Siegert, M. J., Mudd, S. M., Sugden, D. E., Fujita, S., Xiangbin, C., Yunyun, J., Xueyuan, T., and Yuansheng, L.: The Gamburtsev Mountains and the origin and early evolution of the Antarctic Ice Sheet, Nature, 459, 690–693, 2009.; Carter, S. P., Blankenship, D. D., Peters, M. E., Young, D. A., Holt, J. W., and Morse, D. L.: Radar-based subglacial lake classification in Antarctica, Geochem. Geophys. Geosyst., 8, 1–20, doi:10.1029/2006GC001408, 2007.; Christianson, K., Jacobel, R. W., Horgan, H. J., Anandakrishnan, S., and Alley, R. B.: Subglacial Lake Whillans – ice penetrating radar and GPS observations of a~shallow active reservoir beneath a~West Antarctic ice stream, Earth Planet. Sc. Lett., 331–332, 237–245, 2012.; Fretwell, P., Pritchard, H. D., Vaughan, D. G., Bamber, J. L., Barrand, N. E., Bell, R., Bianchi, C., Bingham, R. G., Blankenship, D. D., Casassa, G., Catania, G., Callens, D., Conway, H., Cook, A. J., Corr, H. F. J., Damaske, D., Damm, V., Ferraccioli, F., Forsberg, R., Fujita, S., Gim, Y., Gogineni, P., Griggs, J. A., Hindmarsh, R. C. A., Holmlund, P., Holt, J. W., Jacobel, R. W., Jenkins, A., Jokat, W., Jordan, T., King, E. C., Kohler, J., Krabill, W., Riger-Kusk, M., Langley, K. A., Leitchenkov, G., Leuschen, C., Luyendyk, B. P., Matsuoka, K., Mouginot, J., Nitsche, F. O., Nogi, Y., Nost, O. A., Popov, S. V., Rignot, E., Rippin, D. M., Rivera, A., Roberts, J., Ross, N., Siegert, M. J., Smith, A. M., Steinhage, D., Studinger, M., Sun, B., Tinto, B. K., Welch, B. C., Wilson, D., Young, D. A., Xiangbin, C., and Zirizzotti, A.: Bedmap2: improved ice bed, surface and thickness datasets for Antarctica, The Cryosphere, 7, 375–393, doi:10.5194/tc-7-375-2013, 2013.; Fricker, H. A., Scambos, T., Bindshadler, R., and Padman,&

 

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